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0f34b14b41
## What changed - adds a targeted snapshot test for rollback with contextual diffs in `codex_tests.rs` - snapshots the exact model-visible request input before the rolled-back turn and on the follow-up request after rollback - shows the duplicate developer and environment context pair appearing again before the follow-up user message ## Why Rollback currently rewinds the reference context baseline without rewinding the live session overrides. On the next turn, the same contextual diff is emitted again and duplicated in the request sent to the model. ## Impact - makes the regression visible in a canonical snapshot test - keeps the snapshot on the shared `context_snapshot` path without adding new formatting helpers - gives a direct repro for future fixes to rollback/context reconstruction --------- Co-authored-by: Codex <noreply@openai.com>